Lock the crop to the classic 3:2 ratio — the native shape of 35mm film and almost every DSLR / mirrorless camera.
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From the aspect ratio dropdown, choose 3:2. The crop box locks to a landscape 3:2 frame that can't drift.
Drag to reposition the 3:2 frame. Resize from any corner — the ratio stays locked at exactly 3:2.
Click Download. The output is exactly 3:2 (e.g., 1800×1200 for a print-ready 4×6 at 300 DPI).
3:2 means the width is 3 units for every 2 units of height. It's the standard ratio of 35mm film and almost every DSLR or full-frame mirrorless camera, so it's known as the classic photographic ratio.
The 3:2 ratio comes from 35mm film, where each frame measured 36mm × 24mm — a 3:2 ratio. Digital DSLRs and full-frame mirrorless sensors kept that shape for compatibility with classic lenses and standard print sizes like 4×6.
A 4×6 inch print at 300 DPI requires 1800×1200 pixels (4 × 300 = 1200, 6 × 300 = 1800). That's a perfect 3:2 ratio and the resolution most photo labs ask for.
A 4:3 photo is slightly taller than 3:2. Cropping to 3:2 removes a strip from the top and/or bottom — the tool shows exactly which pixels will be trimmed so you can keep the most important part of the frame.
For 4×6, 8×12, and 12×18 prints, yes — those sizes are all 3:2 so no further cropping is needed at the lab. For 8×10 or 5×7 prints you'd need a different ratio because those are not 3:2.